Centrifugal machine



Dec. 13, 1927.v

C. A. OLCOTT CENTRIFUGAL MACH INE Filed June 5. 1925 uooooO ao'n 0,0 O 0OOO OOO

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Patented Dec. 13, 1927.

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CHARLES A.. OLoor'r. OFNEW Yon-n,A N.'Y.,.A-ssIeNon To s. s.=rrErWonrn-.cor/rrANY,

or New Yoan, N. Y.. A CORPORATION or New YORK.

CENTRrFUeAL MACHINE.

Application fiIcdJune 3, 1925.v Serial ,No 34,641. f

Fig. lis a partial section through a modified bottom construction.

In high speed centrifugals of the type to which my invention relates,such for instance as sugar centrifugals, it is customary to providea-basket bottom 15 in the form of a casting. The outer portion of thiscasting which.surrounds-the cent-ral discharge opening 16, affords aplate-like bottom for the basket which is reinforced on its lowersurface by short radial ribs. Inasmuch as these ribs form vanes which toacertain extent,

. impede the drive of the centrifugal, it has been customary to housethe. ribs by a bottom sheet metal plate commonly referred to as a windplate, which extends from the annulus 17 which forms the outer boundaryof the discharge opening to a point considerably inward of the peripheryof the bottom plate 15. In order to keep the lower peripheral face ofthe plate 15 free from objectionable pockets in which particles maygather and cause an unbalanced condition of the basket, it has beencustomary also to make the periphery of the plate 15 with a bead sosmall that it cannot accommodate the rivet-s. Consequently the wall 18of the basket has been secured to the bottom plate 15 by dowel pinspassing through the lower margin of the basket wall 18 and enteringrecesses in vthe marginal bead of the plate 15 substantially in theplane of the latter. The connection is rendered as secure as possible byshrinking on a steel ring which surrounds the dowel pins and preventstheir escape. The wall of the basket is, however, rat-her thin, and thedepth of the dowel holes in the bead at the periphery of the bottomplate must be accurately regulated and the length of the doWel pinssimilarly determined with accuracy in order to make this attachmentVariations in these dimensions are the source of frequent weakness andfailure,

and more or less trouble with thisfastening is Constantly" experienced.My invention providesn'ot only' a stronger bottomplate,

but a more secure and readily accomplished attachment of the4 basketwall to the bottom plate.

According to my invention'the plate 15 is provided with a peripheralflange 19 of sulicient depth to receive rivets 20 by which the lowermargin of the basket wall 18 is connected to the flange 19. The bottomplate reinforcing ribs 21 are carried from the a'nnulus 17 to the flange19, and thus strengthenl the width. Y

To cover the flanges, the-wind plate 22 is carried from the lower marginof the annulus 17 to the basket wall 18 and is provided with an offsetmargin 23, which overlaps the outer face of the wall.r It is preferablysecured in position by holding screws 24 which take into tapped holes inline wit-h certain of the ribs 21 which are appropri# ately thickened at25 adjacent the flange 19. When thusl assembled, the steel band 26 isshrunk on, thus reinforcing the structure at this point. i

The annulus 17 may be machined at its lower margin to afford a seat 27for the inner margin of the wind plate 22. 'Ihe wind plate is thussubstantially flush with the lower margin of the annulus 17 and affordsa smooth surface from the lower margm of the cent-ral discharge port tothe periphery of the basket. in the ribs, but compltetly eliminatesperipheral pockets in the lower face of the basket bottom in whichmaterial might tend to gather with resulting unbalance of the basket.

In Fig. 4:' I have shown a further modiflcation in which the bottomriveting flange 19 and ribs 21 are retained, while the wind plate andring 26 are combined in an integral relatively heavy plate 28, which maybe shrunk on the basket bottom as a unit. I prefer, however, theconstruction shown in Figs. 1, 2 and 3 since all necessary strength isobtained in that construction without materially increasing the weightof the structure as a whole. l

The details of my .construction may be readily modified withoutdepartingfrom thescope of what I claim as my invention.

I claim as my invention.-

plate 15 throughout its lentire It not only housesy l. In a centrifugalbasket, a bottom easting having a peripheral fiange, a basket Wallriveted to said flange, ribs on the lower 'face of said bottom casting,and a Wind plate Covering said vribs and overlapping said flange,together with a shrunk-on ring embracing said flange, basket Wall andoverlapping margin of the Wind plate toreinforce the struct e. l l

2. In a centri ugal basket, a bottom easting apertured to afford aCentral discharge opening, an annulus forming the outer boundary of saidopening, a flange at'the periphery of the bottom casting, ribs eXtending between said annulus and peripheral fiange, a basket Wallriveted to the'peripheral flange, together With a Wind plate overlappingsaid peripheral liange and extendim:v therefrom tothe annulus to coverthe ribs and afford an uninterrupted smooth surface between the flangeand annulus, and means for securing the overlapped margin of said Windplate at the lperipheral flange.

ln testimony whereof have signed my nameto this specification.

CHARLES A. oLeoTr.

